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Author Topic: Furnace venting  (Read 2491 times)
Casey Patten
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« on: January 17, 2010, 06:24:50 PM »

Hi guys...
I've got a friend in Nebraska that has a question about the venting of his new furnace.  Installed early spring 2009, one of the contractors that bid on it mentioned the distance between the gas meter and the vents.  My thought was the fact that they vented it right over a basement window...thoughts?  Thanks...


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Ron Bero
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« Reply #1 on: January 17, 2010, 08:25:17 PM »

I checked the code check 2006 and came up with this clearances are 10,000 btu is 6 in clearance from bldg  openings -10,000 to 50,000 btu is 9 inches  and 50,000 and up is 12 inches and only rule for placement is no termination where vapor would be a nuisance. So the meter idea may be bad cause  the vapor may cause premature rusting of the meter the base ect. the window should be ok just check for clearances
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Ron Bero
Green Bay Wisconsin
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David Macy
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« Reply #2 on: January 18, 2010, 07:18:30 AM »

Here is an illustration for clearances. Looks to close to window.


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Ron Bero
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« Reply #3 on: January 18, 2010, 09:08:29 AM »

Furnaces w/ combustion air piping terminating in the same locationas vent piping are considered direct vent so 12 inches is fine
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Ron Bero
Green Bay Wisconsin
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Brown,Oconto.Door,Kewaunee,Manitowoc,Calumet,Outagame,Shawano,Oconto,And Marinette Countys
Jay Markanich
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« Reply #4 on: January 19, 2010, 08:15:12 AM »

Casey - from a direct vent installation manual.  These guys could not read...

TERMINATION LOCATION AND CLEARANCES
Vent pipe and combustion-air-supply pipe (when direct
vented) may terminate through a roof or through a sidewall.
Roof termination has the advantages of better pipe
protection and fewer condensate-damage concerns. Use
the following guidelines when choosing a vent location:
?? Flue gases can be corrosive. When sidewall venting,
protect walls with a corrosion resistant material. Also,
terminate away from plants and shrubs.
?? Locate termination consistent with the National Fuel
Gas Code, ANSI Z223.1/NFPA 54 or the CAN/CGA
B149 Installation Codes.
?? Locate termination away from other air intake or
exhaust vents such as dryer vents, other gas appliance
vents, or plumbing vents. Allow at least 3 foot to any
other vent.
?? Terminal must not be located above a walkway,
driveway or within 10 feet of an adjacent building.
?? Do not locate termination underneath a veranda,
porch, or deck.
IN THE UNITED STATES:
?? Allow a minimum clearance of 4 feet from electric
meters, gas meters, regulators, and relief equipment.
?? When non-direct venting, terminal must be at least 4
feet below, or 4 feet horizontally from or one foot above
any door, window or gravity air inlet into a building.
Terminal must also be at least 3 feet above any forcedair
inlet located within 10 feet horizontally.
?? When direct venting, vent terminal must be at least one
foot from any opening through which flue gases could
enter a building.
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